The Organization of the Petroleum Exporting Countries and its allies, a group known as OPEC+, agreed on record output cuts in 2020 to cope with a COVID-induced price crash.
Spot gold rose 0.3pc to $1,781.77 per ounce by 12:48 pm EDT (1648 GMT), after jumping to $1,794.86, its highest level since June 18. U.S. gold futures gained 0.4pc to $1,782.90.
White House COVID-19 senior adviser Jeffrey Zients told reporters the "surge response" teams would be ready to speed additional testing supplies and therapeutics to communities that were experiencing increases in COVID-19 cases.
This week, Portugal, Spain and Malta all abruptly increased restrictions for travellers from the UK, although the three said they would accept fully vaccinated Britons.
Data was reported from blood serum from eight participants obtained one week after they received the second dose of the vaccine in an early-stage trial.